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Claude Sonnet 4.5 vs DeepSeek-V3
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 29.8% higher average benchmark score. Claude Sonnet 4.5 offers 1.9K more tokens in context window than DeepSeek-V3. DeepSeek-V3 is $16.63 cheaper per million tokens. Claude Sonnet 4.5 supports multimodal inputs. Overall, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5 was developed to bridge human thinking and machine assistance, allowing people to work with language and tools in a more conversational and natural way. Built with a focus on turning ideas into results, it represents an evolution in making AI feel less mechanical while maintaining strong capabilities across reasoning, coding, and collaborative tasks.
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DeepSeek
DeepSeek-V3 was introduced as a major architectural advancement, developed with 671B mixture-of-experts parameters and trained on 14.8 trillion tokens. Built to be three times faster than V2 while maintaining open-source availability, it demonstrates competitive performance against frontier closed-source models and represents a significant leap in efficient large-scale model design.
9 months newer
DeepSeek-V3
DeepSeek
2024-12-25
Claude Sonnet 4.5
Anthropic
2025-09-29
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Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00
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DeepSeek-V3
Input:$0.27
Output:$1.10($16.63 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Sonnet 4.5
Average Score:80.3%(+29.8%)
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DeepSeek-V3
Average Score:50.5%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Coding77.2%(+35.2%)
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DeepSeek-V3
Coding42.0%
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.5
2025-01-31
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Claude Sonnet 4.5
2 providers
Anthropic
Throughput: 42 tok/s
Latency: 0.4ms
ZeroEval
Throughput: 42 tok/s
Latency: 0.4ms
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Claude Sonnet 4.5
Avg Score:80.3%(+29.8%)
Providers:2
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DeepSeek-V3
Avg Score:50.5%
Providers:1